The images above are both meaningful and instructive: This man’ s hard work is not only for his own bene-fit, but also for the benefit of the future generations. The pictures serve to re-mind us that the existence of our cur-rent happiness is due to the struggles of our predecessors.

We, in turn, should also try hard to guarantee the comfort and safety of the future generations. Sustainable development has become a topic of heated debate in recent years. While it is justifiable to satisfy current demands, we cannot neglect the needs of our descendants in the process. Our children also depend on the Earth’s natural resources and we should not deprive them of such necessities.

Unfortunately, many people only think of their short-term personal interests. An entire forest might be cut, in the interest of making a profit, with-out a single tree left in its place. People must be taught to appreciate the Earth as not only our home, but also the home of our children and grandchildren, as well as all other plants and animals.